Excel 2007 : Chart defaults for line thickness and axis options

I find the default line thickness in excel 2007 is too thick for most purposes, so as a result I always have to go in and change the line thickness when I plot a line chart. It would be useful if it was possible to set the defaults for line thickness and axis options to the values I most commonly use.

Thanks, I've now created a couple of new chart templates which is great. One thing though is that it's not easy to see which template is which in the Change Chart Type->My Templates box i.e. they all appear with the same icon without a description - unless you hover over each of them with the mouse.

OK so how do I create a template so that everyline is smaller? I am toggling on and off 100-200 lines in my pivot chart.